Rock drill



ROCK DRILL QN E: o o

J m; Afm.

ATTORNEY @Carles FO `uly 2l, 1936. c. F. osGooD Filed NOV. l, 1954 Patented July 21, 1936 ATENT crier.

ROCK DRILL Charles F. Osgood, Claremont, N. H., assigner to Sullivan Machinery Company, a corporation of Massachusetts Application November 1, 1934, Serial No. 751,020

i 15 Claims. .This invention relates to rock drilling mecha- Y nisms, and more 'particularly to improvements inwthe feeding and guiding means for a rock drill of the mounted drifter type. r An object of this invention is to provide an improved rock drill feeding mechanism. Another object is to provide an improved feeding means for a rock drill of the mounted, self-feeding, drifter type. A further object is to provide an improved pneumatic feeding means for a. rock drill whereby a feed of comparatively great length is obtained by means of a relatively compact feeding structure and having improved transmission connections between the power feeding a elements and the drill whereby such compactness Y ible connections are entirely eliminated. A further object is to provide an improved pneumatic feeding mechanism and guide structure for a `rock drill of the mounted drifter type. 'I'hese and other objects and advantages of the invention will, however, hereinafter more fully appear.

In the accompanying drawing there is shown for purposes of illustrationV one form which the invention may assume in practice.

In this drawing,-

Fig. 1 is a top plan view of the illustrative embodimentof the improved rock drilling mechanism.

' YFig. 2 is a side elevational view ofthe 'rock drilling mechanism shown in Fig. 1, parts being shown in longitudinal section to illustrate structural details.

Fig. 3 is a front end elevational View of the rock drilling mechanism shown in Figs. 1 and 2.

Fig. 4 is an enlarged longitudinal sectional ViewV taken substantially on line 4-4 of Fig. 2, with parts omitted.

Fig. 5 is a cross sectional View taken on line I5--5 of Fig. 1. Y

Fig. 6 is a cross sectional view taken substantially on line 6 6 of Fig, 2.

Fig. 7 is a, diagrammatic view of two parts of the control valve. Y As shown in the drawing, the improved rock drilling mechanism is of the mounted drifter type, although it will be evident that the improved structure constituting the features of this invention may be incorporated in drills of various other types.

The drilling mechanism disclosed herein comprises a hammer rock drill generally designated I supported by and guided for longitudinal movement on a feeding and guiding structure generally designated 2 of an improved design. As Shown herein, the hammer drill I may assume any usual form and is herein preferably of the pressure fluid actuated, hammer type having a usual hammer motor for percussively actuating, in a well known manner, a drill steel 3 suitably supported within the forward end of the drill. The improved guide and feed structure 2 comprises a pair of parallel feed cylinders 4 and 5 spaced transversely by end spacing and connecting elements 6 and l' and supported upon a suitable bracket 8 carried by a swivel trunnion 9, the end spacing and connecting elements 6 and 'l being secured to the cylinders and the cylinders being rigidly secured to the bracket 8 in any suitable manner, such for instance as by welding. The hammer drill I is supported directly on and between the parallel cylinders 4 and 5 by the provision of a depending portion I integral with the drill bottom which may be of any suitable longitudinal length so as to provide a suicient bearing surface, while a clamping element II is removably secured to and spaced from the depending portion I!) as by screw bolts I2 and shims I3. The elements IE] and II present concave bearing surfaces I4 Vslidably engaging the adjacent inner portions of the peripheries of the parallel cylinders 4 and 5. As the bearing surfaces wear, the shims I3 may be varied in thickness and the wear taken up. It will thus be seen that the hammer drill is entirely supported by the parallel feed cylinders without the use of any other elements, thereby causing the feed cylinders to perform all the functions of the usual guide shell. Reciprocable in the cylinders 4 and 5 are feed pistons I5 and I6, respectively, the piston I 6 constituting the forward feed piston and the piston I5 constituting the reverse feed piston. Secured by an element I1 threaded within the body of the feed piston I5 is a flexible element I8 herein in the form of a wire rope or cable, and this cable extends forwardly through the forward portion of the feed cylinder 4, through an opening I9 in the front head 20 of that feed cylinder, around a pulley 2| secured by a bracket 22 integral with the connecting elebythe' prvisionof` the improved feeding and guiding 'structure the rock drill is supported and guided in an improved manner, and that by the association'of the feeding elements with the guidin'gfstructure and by guiding the drill directly ontheifeed cylinders the drilling mechanism is rendered vextremely simple in design, and. by its simplicity results in a mechanism Vwhich is of Va more rugged character and relatively inexpensive to manufacture. These and other uses and advantages of the improved drilling mechanism will be. clearly apparent to those skilled in the art.'

While there is in this application specifically described .one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposesV of illustration and that the invention may be'modified and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claims.

. What I claim as new and Letters Patent is:

l.. Ina rock drilling mechanism, parallel feed cylinders, feed pistons reciprocable therein, a tubular member connected to said cylinders, a rock drill, a sealing piston reciprocable in said tubularmember, flexible transmission elements connecting. said feed pistons to said sealing piston, and flexible transmission elements connecting said feed pistons with the rock drill.

2. In a rock drilling mechanism, a rock drill, parallel feed cylinders, feed pistons reciprocable desire to secure by therein, a sealing cylinder connected `to said cylinders,v a sealing piston reciprocable in said sealing cylinder, transmission elements connecting said feed vpistons to said sealing piston, and flexible transmission elements connecting said feed pistons to said rock drill. Y V3. In a rock drilling mechanism, parallel feed cylinders, a parallel tubular member connected tov said cylinders, elements connecting the opposite ends of said feed cylinders and tubular member in rigid spacedrelation, a rock drill, feed pistonsreciprocable -in' said feed cylinders, a sealing piston reciprocable in said tubular member, flexible transmission elements connecting the .opposite ends of said sealing piston with said feed pistons, and flexible transmission elements connecting opposite ends of said feed pistons to the Vopposite ends of said drill.

4. In a rock drilling mechanism, a pair of parallel single-acting feed cylinders each having an end to which actuating pressure is adapted to be supplied, a tubular member arranged parallel with said feed cylinders and connected to and communicating with said ends of said cylinders, means connecting said feed cylinders and said tubular member in rigid spaced relation, a rock drill, feed pistons reciprocable in said feed cylinders, a sealing piston reciprocable in said tubular member and providing a separating wall for preventing communication between said ends of saidV cylinders, flexible transmission means extending within said tubular member for connecting said feed pistons to said sealing piston, and flexible transmission means for connecting said feed pistons to said rock drill.

5. In a rock drilling mechanism, parallel feed cylinders, a parallel tubular member, elements connecting the opposite ends of said feed cylinders and tubular member in rigid spaced relation, said tubular member communicating at one end with one end of one feed cylinder and at its opposite end with the opposite end of the other feedlcylinder, 'a rock'drill, feed pistons reciprocable in said feed cylinders, a sealing piston reciprocable in said .tubular member, flexible transmission means connecting said feed pistons to said sealing piston, and flexible transmission means connecting said feed pistons to the rock drill.:`

6. In a ro'ck drilling'mechanism, parallel feed cylinders, la rock drill guided for movement longitudinally of said cylinders, a tubular member extending longitudinally between said feed cylinders and 4having reversely bent front and'r'ear'end portions, the` front portion of said tubular Vmember communicating with the forward end of'one feed cylinder and the rear portion. -of'r said` tubular member communicating with the rear end ofthe other feed cylinder, feed pistons -reciprocable in said feed cylinders, a? sealing! piston reciprocable in said tubular member, connections between said feed pistons and said sealing piston, said connections extending within said tubular member into connection with the opposite ends of the sealing piston and guided by the inner surfaces of the reversely bent portions of said tubular member, and connections between said feed pistons and the rock drill.

7. In a rock drilling mechanism, a rock drill, parallel feed cylinders, pistons reciprocable in said feed cylinders, a conduit connecting one end of one feed cylinder to the opposite end of the other feed cylinder, means for connecting said feed pistons with the rock drill, a sealing means arranged within said conduit, and means for connecting said feed pistons to said sealing means.

8. Ina rock drilling mechanism, a rock drill, parallel feed cylinders, pistons reciprocable in said feedcylinders, a conduit connecting one end of one feed cylinder with the opposite end of the other feed cylinder, said conduit having a portion arranged parallel with and extending longitudinally between said feed cylinders, means connecting said feed pistons to the rock drill, a sealing piston reciprocable within said longitudinal parallel portion of said conduit, and means connecting said feed pistons with said sealing piston. Y

9. In 'a rock drilling mechanism, the combination with a'rockdrill to be fed, of parallel single-acting feed cylinders each having an end to which actuating pressure is adapted to be supplied, feed pistons reciprocable in said cylinders, a tubular member connected to said cylinders in communication with said ends of said cylinders, a sealing piston reciprocable in said tubular member and providing a separating wall for preventing communication between said ends of said cylinders, flexible transmission means extending Within said tubular member for connecting said feed pistons to said sealing piston, and flexible transmission means connecting said feed pistons to said rock drill.

10. In a rock drilling mechanism, the combination with a rock drill to be fed, of parallel feed cylinders each having an open end, a tubular member arranged parallel with said cylinders and connected to the opposite ends of said cylinders, means connecting said feed cylinders and tubular member in rigid spaced relation, feed pistons reciprocable in said feed cylinders, a sealing piston reciprocable in said tubular member and providing a separating wall for preventing communication between said ends of said cylinders with which said tubular member is connected, flexible feed cylinder andat its opposite endf with Athe rear end of the otherV cylinder, feed pistons reciprocable insaidffeed cylinders, a sealing piston reciprocable in `saidtubular memberland providing `a separating wall between Asaid ends of said feed cylinders with which said tubular member communicates, flexiblevltransmission Vmeans Vextending within saidtubular member'forcon-Y .necting said feed pistons to saidjsealing piston,

and flexible transmissionmeans connecting said feed pistons to saidrockdrilland having portions extending out through said open endsof said feed cylinders. l

l2. In a rock drilling mechanism, the combination with a rock drill to be fed, ofparallel feed cylinders, one cylinder Yhaving an open front end andthe other cylinder having an open rear end, a tubular member extending longitudinallyV be.

tween said feed cylindersjn parallel relation therewith and having reversely bent frontvand rear end'portions communicating with the opposite ends of said cylinders, the front end'portion Vof said tubular member communicating with the forward end of one feed vcylinder and the rear end portion of said tubularmember communicating with the rear end of the other feed cylinder, feed pistons reciprocable in said feed cylinders, a Vsealing piston reciprocable in ,said tubular member and providinga separating wall between the ends of said feed cylinderslwith which said tubular member` communicates, vconnecting means between said feed pistons .and said sealing, piston including means extending within said tubular member into connection with the opposite ends of saidsealing piston and guided by the inner surfaces of said reverselybent end portions of said tubularrmemben and Vconnecting means.

means between said-ifeedpistons. and saidrock drill including connections extending. out through said openendsrof said cylinders. i

13.Y In a-rockY drilling mechanism,zparallel,feed

cylinders each having an open end, a. rock drill, feedgpistons reciprocablein said feed cylinders, means i ,for connecting said; feed pistons to ysaid rock drilland includingconnections extending providing a Vseparating wall for Apreventingcommunication between the sealed ends of Asaid cylinders, and means extending vwithirrsaid conduit and into the `sealed ends of said feed cylinders for connecting said feedfpistons to saidy sealing Y 14. In a-rock arming meehansmparaiiei feed cylinders 'each having an open end, a rockdrill, Y

feed pistons reciprocable inV said feed cylinders, means connecting said feed pistons to said Vrock drill and including means extendlngout through said open ends of said feed cylinders, and sealing meansvfor `the opposite ends of said feed cylinders including a conduit; communicating with the sealed ends o fsaidV cylinders, said conduit having a portion arranged parallelwith andY extending longitudinally between sraidfeed cylinders, sealing means` `recprocable` within said, longitudinal parallel portion of said conduit andproviding a separating Wall for rpreventing communication between thesealed ends Vof said cylinders,v andV means extending 'within said conduit and into the sealed ends of saidifeed cylinders for Vconnecting' said feed pistons to said sealing means; i

15l In a rock drilling mechanism, parallel feed cylinders, a parallel tubular member, elementsV connecting the opposite ends Lof said feed cylinders and tubular member in rigid spacedrelation, said tubular member communicating at` one end with one end ofgone feed cylinder and. at its opposite end `with theopposte end of the other feed cylinder, a rock drill, feed pistons reciproca--Y ble in said feed cylinders, sealing means recipro-V cable in said tubular member, connections between saidfeed pistons and said sealing means,

- and' connections between said feed pistons and saidrockdrill. ,Y Y

CHARLES F. OSGOOD.V 

